I think you did the right thing. Some people just don't know they have options. I mean as soon as I heard the term "transgender" I knew it applied to me, but I dared not learn anything about it because I figured there was nothing I could do about it anyway.
I've been using the computer from a young age, and one time I saw a post on a forum like the one you described. The person said she was born male but felt female, and it was the first time I had ever heard of other people going through something similar to what I was dealing with. I wanted to send her a message and say, "Wow, I know how you feel, I'm the opposite of your situation," but I never did. I just kind of read through the replies of people saying, "That's weird, I couldn't imagine feeling like that." I still wonder what would have happened if I tried. But seriously, I was glad to know that at least I wasn't alone. Things like that can build up over time and finally make the person realize that, no, you don't have to be trapped in a body you aren't comfortable in. That's how it was for me, and I hope it was the same for this girl.